Garbage incinerator

Abstract

The invention discloses a garbage incinerator, and relates to the technical field of garbage incineration treatment, the garbage incinerator comprises an incinerator body, a middle arch and a recirculation flue gas spray pipe, the middle arch is arranged in a hearth of the incinerator body and is located among a front arch, a rear arch and a combustion section fire grate, and a first flue gas channel can be formed between the middle arch and the front arch; a second flue gas channel can be formed between the middle arch and the rear arch, so that high-temperature flue gas in a hearth of the incinerator body flows through the first flue gas channel and the second flue gas channel, is converged above the middle arch and then enters the flue; the recirculating smoke spraying pipes are arranged at the bottom of the middle arch and used for spraying low-temperature smoke into a hearth of the incinerator body, at least one set of recirculating smoke spraying pipes face the front side of the middle arch, and at least one set of recirculating smoke spraying pipes face the rear side of the middle arch. The anti-coking middle arch is arranged in the hearth, disturbance of high-temperature flue gas is increased, volatile components are promoted to be mixed with oxygen, and the combustion efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of garbage incineration treatment, in particular to a garbage incinerator. Background Art

[0002] Waste incinerators are equipment for incinerating and treating waste. The main types include mechanical grate incinerators, fluidized bed incinerators and rotary kiln incinerators.

[0003] Among them, a group of stepped grates are set at the bottom of the furnace of the mechanical grate incinerator. The garbage is fed in from the upper part of the grate. With the movement of the grate, the garbage passes through the drying stage, combustion stage and burnout stage on the grate in turn. During this process, the air system under the grate will provide an appropriate amount of air to enable the garbage to burn evenly.

[0004] However, since the high-temperature flue gas generated during the combustion stage of the above-mentioned incinerator flows directly through the furnace to the flue, the oxygen therein cannot be effectively mixed with the volatile matter (CO, CH4, etc.) produced by the combustion, which can easily cause the tail CO to exceed the standard. Summary of the invention

[0005] The purpose of the present invention is to provide a waste incinerator to solve the problems existing in the above-mentioned related technologies. By arranging an anti-coking middle arch in the furnace, the disturbance of the high-temperature flue gas can be increased, the mixing of volatile matter and oxygen can be promoted, and the combustion efficiency can be improved.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a garbage incinerator, comprising an incinerator body, wherein a garbage feeding port is arranged at the front end of the furnace of the incinerator body, a slag discharging port is arranged at the rear end of the furnace of the incinerator body, a front arch is arranged at a position near the garbage feeding port on the top of the furnace of the incinerator body, a rear arch is arranged at a position near the slag discharging port on the top of the furnace of the incinerator body, and a flue is arranged at a position between the front arch and the rear arch on the top of the furnace of the incinerator body; a drying section grate, a combustion section grate and a burnout section grate are arranged in sequence at the bottom of the furnace of the incinerator body from front to back; and the incinerator body further comprises an intermediate arch and a recirculating flue gas nozzle, wherein the intermediate arch is arranged in the furnace of the incinerator body and is located between the front arch and the rear arch. , between the rear arch and the combustion section grate, and a first flue gas channel can be formed between the middle arch and the front arch, and a second flue gas channel can be formed between the middle arch and the rear arch, so that the high-temperature flue gas in the furnace of the incinerator body flows through the first flue gas channel and the second flue gas channel, and enters the flue after merging above the middle arch; the recycled flue gas nozzle is arranged at the bottom of the middle arch, and the recycled flue gas nozzle is used to spray low-temperature flue gas into the furnace of the incinerator body, and at least two groups of recycled flue gas nozzles are arranged, wherein at least one group of the recycled flue gas nozzles faces the front side of the middle arch, and at least one group of the recycled flue gas nozzles faces the rear side of the middle arch.

[0008] Preferably, the middle arch is a rectangular plate structure, and the length direction of the middle arch is perpendicular to the side wall of the incinerator body.

[0009] Preferably, the middle arch is arranged to be inclined downward from front to back.

[0010] Preferably, the angle between the middle arch and the horizontal plane is 10°-20°.

[0011] Preferably, the distance between the front side of the middle arch and the front arch is greater than or equal to 1.3m, the distance between the rear side of the middle arch and the rear arch is greater than or equal to 1.3m, and the distance between the rear side of the middle arch and the combustion section grate is greater than or equal to 1.5m.

[0012] Preferably, each group of the recirculating flue gas nozzles comprises a plurality of branch pipes evenly distributed along the length direction of the middle arch.

[0013] Preferably, the angle between the branch pipe facing the front side of the middle arch and the middle arch is 20°-45°.

[0014] Preferably, the angle between the branch pipe facing the rear side of the middle arch and the middle arch is 20°-45°.

[0015] Preferably, a garbage pusher is also provided at the front end of the furnace of the incinerator body, and the garbage pusher is located below the garbage feed port.

[0016] Preferably, a water-cooled wall is also provided on the middle arch.

[0017] Compared with the related art, the present invention has achieved the following technical effects:

[0018] The garbage incinerator provided by the present invention comprises an incinerator body, an intermediate arch and a recirculating flue gas nozzle, wherein the intermediate arch is arranged in the furnace of the incinerator body and is located between the front arch, the rear arch and the combustion section grate, and a first flue gas channel can be formed between the intermediate arch and the front arch, and a second flue gas channel can be formed between the intermediate arch and the rear arch, so that when the high-temperature flue gas in the furnace of the incinerator body flows through the intermediate arch, a part of the high-temperature flue gas passes through the first flue gas channel, and another part of the high-temperature flue gas passes through the second flue gas channel, and then the two parts of the high-temperature flue gas merge above the intermediate arch and enter the flue, which greatly increases the disturbance of the high-temperature flue gas and promotes the combustion of the high-temperature flue gas. The mixing of volatile matter and oxygen improves the combustion efficiency, reduces the excess air coefficient from 1.4-1.6 to 1.3-1.4, and improves the boiler efficiency by more than 0.5%; at the same time, at least two groups of recirculating flue gas nozzles are arranged at the bottom of the middle arch, wherein at least one group of recirculating flue gas nozzles faces the front side of the middle arch, and at least one group of recirculating flue gas nozzles faces the rear side of the middle arch, and low-temperature flue gas is respectively sprayed into the front and rear sides of the middle arch through the two groups of recirculating flue gas nozzles, and the nozzle airflows of the two groups of recirculating flue gas nozzles flow through the front and rear sides of the middle arch respectively, thereby reducing the flue gas temperature on the front and rear sides of the middle arch, thereby effectively preventing the middle arch from being coked and blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of a waste incinerator provided by an embodiment of the present invention;

[0021] Figure 2 This is a simulation diagram of the flue gas flow effect in a waste incinerator provided in an embodiment of the present invention.

[0022] In the figure: 1-furnace of the incinerator body, 2-garbage feeding port, 3-slag discharging port, 4-front arch, 5-rear arch, 6-flue, 7-drying section grate, 8-combustion section grate, 9-burnout section grate, 10-garbage pusher, 11-middle arch, 12-recirculating flue gas nozzle. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The purpose of the present invention is to provide a garbage incinerator to solve the problems existing in the related technology. By arranging an anti-coking middle arch in the furnace, the disturbance of the high-temperature flue gas can be increased, the mixing of volatile matter and oxygen can be promoted, and the combustion efficiency can be improved.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 As shown, this embodiment provides a waste incinerator, including an incinerator body, a garbage feed port 2 is arranged at the front end of the furnace 1 of the incinerator body, a slag discharge port 3 is arranged at the rear end of the furnace 1 of the incinerator body, a front arch 4 is arranged at the top of the furnace 1 of the incinerator body near the garbage feed port 2, a rear arch 5 is arranged at the top of the furnace 1 of the incinerator body near the slag discharge port 3, and a flue 6 is arranged at the top of the furnace 1 of the incinerator body between the front arch 4 and the rear arch 5; the bottom of the furnace 1 of the incinerator body is from front to back A drying section grate 7, a combustion section grate 8 and a burnout section grate 9 are sequentially arranged; specifically, a garbage pusher 10 is also arranged at the front end of the furnace 1 of the incinerator body in this embodiment, and the garbage pusher 10 is located below the garbage feed port 2. When in use, the garbage pusher 10 can push the garbage falling from the garbage feed port 2 onto the drying section grate 7. With the staggered movement of the drying section grate 7, the combustion section grate 8 and the burnout section grate 9, the garbage passes through the drying stage, the combustion stage and the burnout stage in sequence, and is discharged from the slag discharge port 3.

[0027] In this embodiment, the waste incinerator also includes a middle arch 11 and a recycled flue gas nozzle 12. The middle arch 11 is arranged in the furnace 1 of the incinerator body and is located between the front arch 4, the rear arch 5 and the combustion section grate 8. A first flue gas channel can be formed between the middle arch 11 and the front arch 4, and a second flue gas channel can be formed between the middle arch 11 and the rear arch 5, so that the high-temperature flue gas in the furnace 1 of the incinerator body flows through the first flue gas channel and the second flue gas channel, and enters the flue 6 after merging above the middle arch 11, which greatly increases the disturbance of the high-temperature flue gas, promotes the mixing of volatile matter and oxygen therein, improves the combustion efficiency, reduces the excess air coefficient from 1.4-1.6 to 1.3-1.4, and improves the boiler efficiency by more than 0.5%.

[0028] In this embodiment, the recirculating flue gas nozzle 12 is arranged at the bottom of the middle arch 11. The recirculating flue gas nozzle 12 is used to spray low-temperature flue gas into the furnace 1 of the incinerator body, and at least two groups of recirculating flue gas nozzles 12 are arranged, wherein at least one group of recirculating flue gas nozzles 12 faces the front side of the middle arch 11, and at least one group of recirculating flue gas nozzles 12 faces the rear side of the middle arch 11. The nozzle airflows of the two groups of recirculating flue gas nozzles 12 flow through the front and rear sides of the middle arch 11 respectively, such as Figure 2 As shown, the flue gas temperature on both sides of the middle arch 11 is reduced, thereby effectively preventing the middle arch 11 from being coked and blocked; the garbage incinerator provided in this embodiment is suitable for solid waste incineration, especially for efficient and low-pollution incineration of domestic garbage.

[0029] It should be noted that the source of the flue gas of the recycled flue gas nozzle 12 in this embodiment is the low-temperature flue gas after purification and dust removal discharged from the tail end of the subsequent flue gas purification device. The temperature of the low-temperature flue gas is 160°C-300°C, which is much lower than the temperature of the high-temperature flue gas in the waste incinerator (900°C-1100°C); the flow rate of the low-temperature flue gas ejected from the recycled flue gas nozzle 12 is 10m / s-20m / s.

[0030] In this embodiment, the middle arch 11 is a rectangular plate structure, and the length direction of the middle arch 11 is perpendicular to the side wall of the incinerator body (that is, the length direction of the middle arch 11 is Figure 1 in the direction perpendicular to the paper surface).

[0031] In this embodiment, the middle arch 11 is arranged to be inclined downward from front to back.

[0032] Furthermore, the included angle between the middle arch 11 and the horizontal plane is 10°-20°, and is preferably 15° in this embodiment.

[0033] In this embodiment, the distance between the front side of the middle arch 11 and the front arch 4 is greater than or equal to 1.3m, the distance between the rear side of the middle arch 11 and the rear arch 5 is greater than or equal to 1.3m, and the distance between the rear side of the middle arch 11 and the combustion section grate 8 is greater than or equal to 1.5m.

[0034] In this embodiment, each group of recirculating flue gas nozzles 12 includes a plurality of branch pipes evenly distributed along the length direction of the middle arch 11 .

[0035] Furthermore, the angle between the branch pipe facing the front side of the middle arch 11 and the middle arch 11 is 20°-45°; the angle between the branch pipe facing the rear side of the middle arch 11 and the middle arch 11 is 20°-45°.

[0036] In this embodiment, a water-cooled wall is further provided on the middle arch 11 , which enhances the cooling effect on the flue gas around the middle arch 11 and helps prevent the middle arch 11 from being coked and blocked.

[0037] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A garbage incinerator, comprising an incinerator body, a garbage feed port is arranged at the front end of the furnace of the incinerator body, a slag discharge port is arranged at the rear end of the furnace of the incinerator body, a front arch is arranged at the top of the furnace of the incinerator body near the garbage feed port, a rear arch is arranged at the top of the furnace of the incinerator body near the slag discharge port, and a flue is arranged at the top of the furnace of the incinerator body between the front arch and the rear arch; a drying section grate, a combustion section grate and a burnout section grate are arranged in sequence from front to back at the bottom of the furnace of the incinerator body; characterized in that: It also includes a middle arch and a recycled flue gas nozzle, wherein the middle arch is arranged in the furnace of the incinerator body and is located between the front arch, the rear arch and the combustion section grate, and a first flue gas channel can be formed between the middle arch and the front arch, and a second flue gas channel can be formed between the middle arch and the rear arch, so that the high-temperature flue gas in the furnace of the incinerator body flows through the first flue gas channel and the second flue gas channel, and enters the flue after merging above the middle arch; the recycled flue gas nozzle is arranged at the bottom of the middle arch, and the recycled flue gas nozzle is used to spray low-temperature flue gas into the furnace of the incinerator body, and at least two groups of recycled flue gas nozzles are arranged, wherein at least one group of the recycled flue gas nozzles faces the front side of the middle arch, and at least one group of the recycled flue gas nozzles faces the rear side of the middle arch.

2. The waste incinerator according to claim 1, characterized in that: The middle arch is a rectangular plate structure, and the length direction of the middle arch is perpendicular to the side wall of the incinerator body.

3. The waste incinerator according to claim 2, characterized in that: The middle arch is arranged to be inclined downward from front to back.

4. The waste incinerator according to claim 3, characterized in that: The angle between the middle arch and the horizontal plane is 10°-20°.

5. The waste incinerator according to claim 3, characterized in that: The distance between the front side of the middle arch and the front arch is greater than or equal to 1.3m, the distance between the rear side of the middle arch and the rear arch is greater than or equal to 1.3m, and the distance between the rear side of the middle arch and the combustion section grate is greater than or equal to 1.5m.

6. The waste incinerator according to claim 2, characterized in that: Each group of the recirculating flue gas nozzles comprises a plurality of branch pipes evenly distributed along the length direction of the intermediate arch.

7. The waste incinerator according to claim 6, characterized in that: The angle between the branch pipe facing the front side of the middle arch and the middle arch is 20°-45°.

8. The waste incinerator according to claim 6, characterized in that: The angle between the branch pipe facing the rear side of the middle arch and the middle arch is 20°-45°.

9. The waste incinerator according to claim 1, characterized in that: A garbage pusher is also provided at the front end of the furnace of the incinerator body, and the garbage pusher is located below the garbage feeding port.

10. The waste incinerator according to any one of claims 1 to 9, characterized in that: A water-cooled wall is also provided on the middle arch.

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